Gosh the award booking process is anything but simple.
Two interesting things I discovered today:
1. Seats can appear retrospectively. So if you see no seats avail in your desired routing, class and dates, when you think they should show up - don't give up! I've gone back a week or two and found J seat availibility that wasn't there on the original day of release.
2. Some advance dates are inactive (or not). For example today (July 12) we should be able to see 353 days in advance (ie to June 30 2025). Do a search for June 30 and you see some advance dates appear in the date scroll selector eg July 2 or July 5. Select these and nothing happens, so you think they are inactive, BUT if you go back a week and select eg June 24 first, then come back July 2 or 5 are suddenly active! (Disclaimer: I haven't taken this through to actually booking yet so not sure if this is just like a preview or actually enables you to book)
Hoping the observations are useful for others....